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MailSteward vs Eonvelope: catalog facts
MailSteward	Eonvelope
Paid Lite costs $24.95, MailSteward $49.95 and Pro $99.95, with a trial version available.	Free Free and open source under the AGPL-3.0 licence.
macOS	Web, Self-hosted
Searchable long-term archive for Apple Mail and Gmail Unlimited database size even in the Lite edition	Supports IMAP, POP, Exchange and JMAP Thread detection and separate storage of attachments and correspondents
macOS only Pro edition requires setting up a MySQL server	Requires running a Docker stack and accessing it over HTTPS Smaller project with a short track record
Downloadable app	Self-hosted
Closed source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.